【摘要】 鉴于海洋沉积物是13 7Cs在海域内迁移的最终归宿 .建立了沉积物中污染物纵向迁移分布的定量模型 ,在机理分析中充分考虑了海水 表层沉积物界面上通过沉降、扩散、吸附 解吸等作用完成的物质传输 ,并对大亚湾内 4个监测点底质芯样中13 7Cs活度进行了模拟分析 ,对未来底质中13 7Cs的富集趋势进行了预测更多还原

【Abstract】 As a long\|lived and critical artificial radionuclid, 137 Cs from GNPS(Guangdong Nuclear Power Station) plays an important role in the study of monitoring and assessing marine radioactivity in Daya Bay. Marine sediment is the final repository for 137 Cs in marine environment. The study on vertical migration of 137 Cs in marine sediment is important to make proper assessment for radionuclides impact on Daya Bay from GNPS. A quantitative vertical migration model for radionuclides in sediment presented in the paper. The mechanism of transport happened in the sediment\|water interface through sedimentation, diffusion and sorption\|desorption, etc. is taken into account comprehensively. The modeling analysis was conducted on the migration and distribution of 137 Cs versus the depth based on data of 4 samples of sediment cores, and the trend of 137 Cs migration and accumulation in the future was predicted.更多还原